Glass filter and method of manufacture thereof



Oct. 17, 1944. y x D. R. MA'r'rooN- GLA-ss FILTER Am: METHOD oF MANUFACTURE THEREOF Filed Nov. 1, 1941 manner without departing from the scope of the invention.

Patented' Oct. 17,*1944 FILTER AND METHODOF' -MANUFACTURE THEREOF Deo R. ltattoon, Corning', N. Y.,v assigner 'to Coming Glass Works, Corning, N. Y., a corpora tion of New York Application November 1, 1941,4 Serial No. 417,534i

(Cl. 21o-162) 7 Claims. The present invention relates to filtering units,

and is particularly concerned with a novel method of perforating glass articles in a manner whichv is economical and satisfactory for the-manufactureof coffee baskets for use in percolators and the like, although the invention is not necessarily limited `to such use.

`A filter unit such-as required for use as-the coifee basket` of a percolator, to operate satisfactorily, must have apertures therethrough of suchsize and number or character as to permit the passagel of a large volume ofiiuid therethrough without overowing. Also the size and shape of the perforations must be such as to prevent an appreciable amount of sediment from passing' therethrough. In the past great dimculty and'expense has been involved in imparting these qualities to glass coffee baskets, prohibiting their use in popular priced ware.

.'An object of the present invention is an economical method of perforating articles.

Another object is a new artlcle'of manufac ture.

Fig. 1 of the accompanying drawing is a side elevational' view in section of a collec basket ,embodying the invention, and

of coifee basket also embodying the invention.

v In the structure of Fig. 1 a conventional form In thejstructure of mg. 2 the basket nas'rldges or corrugations -II and lvl formed-therein to form wall and bottom portions through `which slotted perforations Il may be read-ily sawed.,- Obviously'filter plates and/or-units of various other configurations4 composed of glass or other suitable materials can be perforated in a similar spirit and- What is claimed is: I

1. As an article of manufacture a glass filter I comprising a bottom and an adjoining side wall having slots` therethrough where they adjoinone another.

2. As an article of manufacture a glass lter comprising a ridged bottom and an adjoining' ridged side wall, 'saidA bottom and side wallhaving slots therethrough which extendvtransversely through the ridges thereof,

3. I'he method of manufacturing a glass strainer basket for a percolator which includes 'forming a container witha.. closed bottomv and a surrounding upstanding side -wall and cutting slots through the bottom and side wall where they adioinone another. v

strainer basketfor va percolator which includesforming a .basketwith corrugations therein in 4. The' method ofmanufacturing a glass strainer 'basket for a. percolator which includes forming a corrugation in a wall of the basket and then perforating the basket wall by cutting slotsy transversely through the corrugations.

5. The method of` manufacturing a glass partsthereof to contain perforations and then v sawing slots transversely through the'corrugaa Fig. 2 is a similar view of an alternative form A tions.

6. A circular open topped glass' strainer basket fora percolator having a bottom and an adjoining sidewall4 and having perforations therethrougnm the form orslots extending downward from a height well below the top of the sidewall and inward `through the bottom a substantial 

